2006 Acute Toxicity of Monothanolamine, Diethanolamine, Diethylene Glycol and Triethylene Glycol to Rainbow Trout, Daphnia Magna and Hyalella Azteca

The acute toxicity of monoethanolamine (MEA), diethanolamine (DEA), diethylene glycol (DEG), and triethylene glycol (TEG) were selectively tested using the following test methods and species:

Amines

Glycols

MEA

DEA

DEG

TEG

Acute 96-hr Rainbow Trout Survival Test (EPS 1/RM/9)

Acute 48-hr Daphnia magna Survival Test (EPS 1/RM/11)

Acute 96-hr Hyalella azteca Survival Test (EPS 1/RM/33)

The LC50s and 95% confidence limits, based on nominal concentrations, were as follows:

Amines (mg/L)

Glycols (g/L)

MEA

DEA

DEG

TEG

96-hr Rainbow Trout

105 (85, 145)

460 (250, 625)

66 (50, 100)

N/A

48-hr Daphnia magna

66.7 (60.1-74.1)

N/A

62.63 (57.63-68.07)

N/A

96-hr Hyalella azteca

170 (163-177)

344 (312-377)

65.98 (61.69-70.56)

43.5 (39.4, 48.1)

The measured concentrations at test initiation and completion were generally within 20% of nominal concentrations, indicating that the test substance concentrations were satisfactorily maintained during the exposure periods. The ranges of values (%measured/nominal) are presented below:

MEA

DEA

DEG

TEG

96-hr Rainbow Trout

93-101%

96-110%

83-106%

N/A

48-hr Daphnia magna

85-118%

N/A

92-105%

N/A

96-hr Hyalella azteca

79-104%

93-100%

84-91%

83-90%

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